#30: Quick conversion screen

[mdrlzy]

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[kirillt]

@mdrlzy Could you also implement these features in this PR?

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[mdrlzy]

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Impossible to implement, we need a prepared file or API with a description (flag, pictogram) for each currency

[kirillt]

Looks good. We need to work also on new enhancements:

• [x] Default screen should be "quick mode"
• [x] Quick mode should have switch between views (let's call tag cloud "3D" in it) We can remove the preference from Preferences screen and just remember state of the switch.
• [x] Additional "detailed" view would be great, i.e. list of the following format: [CODE] [Full currency name] [Country] for fiat [CODE] [Blockchain name] for crypto List could be formatted as 1 or 2 columns.
• [x] We need to find a method of adding new target currency quickly.

[kirillt]

Also really small bug (appeared long time ago):

• [x] In currency search dialog, user can input new line

[kirillt]

Only 1 minor UI issue left:

• [x] "Convert XXX to:" label is too close to the input, I think it should be aligned to be right near the list of base currencies